Not identifying and rejecting tasks titled all whitespaces as empty task

[Alan052918]

When creating a new task in task edit view, leaving the title blank on save would trigger a warning prompt on the bottom of the screen that says "Empty task not saved.". However, filling the title with whitespaces wouldn't trigger the prompt and the blank-titled task is not killed. I propose that whitespace-titled tasks should be ruled as illegal and treated as actual "empty" tasks.